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    <p>All browsers and crawlers send something called a HTTP_USER_AGENT string to the web server upon every request, unless it is not added by the software on purpose. This string identifies what browser is used, what version it is, render engine and some more details. (See <a href="http://en.wikipedia.org/wiki/User_agent" rel="nofollow">http://en.wikipedia.org/wiki/User_agent</a>)</p> <p>The web server can read the HTTP_USER_AGENT and change the content served. For instance, it is used as a part of detecting wether you are on a handheld device or a large screen, in which cases you may want a different layout of the given web page.</p> <p>People put a lot of money into driving traffic to their sites, especially through the large search engines like Google and Bing. The term SEO, which stands for Search Engine Optimization, is a technique where the owner of the web page optimizes his content to make it easy for the search engines to give relevant hits. If you have a complex site using lots of JavaScript and Ajax, you may want to serve a static page to the search engines to allow them to read your content.</p> <p>Malicious sites sometimes serve auto generated, SEO optimized content to the search engines to rank high in searches but deliver human users a simple page with ads instead to drive revenue.</p> <p>This answer is provided as an alternative to an answer where normal dynamic content, as already described by icyrock-com, is the cause of getting another page than Google indicates.</p>
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